I'm a straight talk customer I went from an LG Sunset to a Galaxy s5. Now the s5 I got gently used and it's unlocked but it was a Verizon phone and my straight talk is through AT&T. Everything else on the phone works great, I can make calls, use voicemail, text message etc but I can not send or receive pictures. If someone sends a pic via text message a box will come up saying "downloading"...than it wont download. Same happens when I send one to somebody. I've tried several different APN settings with no luck. Is this all because it used to be a Verizon phone and is now running on AT&T's network? Any help is GREATLY appreciated! Thanks.